U0805 - Understanding DTC U0805: Common in 2015-2019 Ford Explorer and Other Models

Quick Answer

U0805 means: U0805 signifies a communication issue between vehicle control modules.

Fix: Check and replace faulty components Cost: $300 - $1,200 Time: 90-180 minutes

Can I drive with U0805? Immediate diagnosis and repair are recommended to ensure vehicle safety and performance.

Common Questions

What does U0805 mean and how does it affect my car?

The U0805 code indicates a communication failure between control modules, which can impact vehicle performance and safety. It can lead to issues like inaccurate speed readings and loss of traction control.

What are the most common causes of U0805 and how much does it cost to fix?

Common causes include faulty wiring or connectors, defective ABS modules, and ECM issues. Repair costs can range from $100 for wiring repairs to over $1,200 for module replacements.

Can I drive my car with U0805 or should I stop immediately?

While you may be able to drive, it is not advisable due to potential safety risks. Ignoring this code can lead to further damage and increased repair costs.

How can I diagnose U0805 myself using GeekOBD APP?

Using the GeekOBD APP, scan your vehicle for codes, review freeze frame data, and monitor real-time parameters to identify which module is affected and guide your repairs.

What vehicles are most commonly affected by U0805?

Commonly affected vehicles include the 2015-2019 Ford Explorer, 2016-2018 Chevrolet Malibu, and 2017-2019 Honda CR-V. Check for any known recalls or technical service bulletins related to these models.

How can I prevent U0805 from happening again?

Regular vehicle maintenance, including inspecting wiring and connectors, can help prevent U0805. Keeping your vehicle clean and free from moisture can also reduce the risk of electrical issues.

What is U0805?

DTC code U0805 indicates a communication problem between control modules in your vehicle, specifically related to the vehicle speed control system. This code typically arises when one module sends a signal that is not recognized by another module. The most common scenario is a failure in the communication line between the Engine Control Module (ECM) and other control units. For example, if your Ford Explorer is exhibiting this code, it may result from a malfunctioning ABS module or an issue with the powertrain control module. The implications of a U0805 code can range from minor inconvenience, such as a malfunctioning speedometer, to a significant safety risk if it affects vehicle stability control. In real-world terms, this means your vehicle may not accurately report speed, leading to erratic driving behavior and affecting systems like traction control and anti-lock braking. Immediate attention is advisable to avoid further complications or potential safety hazards. Understanding this code and addressing it promptly can save you from costly repairs and enhance your driving experience.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0805 is present:

  • Check engine light illuminates and remains lit, indicating a persistent issue with vehicle systems.
  • Erratic speedometer readings are common; for example, you might notice your speedometer fluctuating or failing to display the correct speed.
  • Traction control warning light may activate, leading to reduced driving stability, especially in slippery conditions.
  • Reduced engine performance can manifest as sluggish acceleration or power loss under load.
  • In some cases, you may experience difficulty with the cruise control system, which may not engage or function properly.

Possible Causes

Most common causes of U0805 (ordered by frequency):

  1. The most common cause of U0805 is a faulty communication line between control modules, with a likelihood of around 60%. This can be due to damaged wiring or connectors.
  2. A defective ABS module or a malfunctioning ECM can also trigger this code, which might happen in 25% of cases, indicating a failure in the signal processing unit.
  3. Poor ground connections or corroded connectors can lead to intermittent communication failures; regular inspections and maintenance can help prevent these issues.
  4. Less common but serious causes include software issues within the control modules, which may require software updates or reprogramming.
  5. Rarely, physical damage to control modules from accidents or water intrusion can cause this code to appear.

U0805 Repair Costs

Cost Breakdown by Repair Type

Module Replacement

Replacing the faulty ABS or ECM module based on diagnostic findings.

  • Total: $300 - $1,200
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors to restore communication.

  • Total: $100 - $300
  • Success rate: 75%
Money-Saving Tips for U0805
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional U0805 Diagnosis Process

Follow these systematic steps to accurately diagnose U0805. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: 2016 Ford Explorer U0805 Repair Case

Vehicle: 2016 Ford Explorer, 70,000 miles

Problem: Customer reported erratic speedometer readings and traction control warnings.

Diagnosis: Diagnostic scan revealed U0805. Inspection found corroded connectors at the ABS module.

Solution: Replaced corroded connectors and cleared the code.

Cost: $250 (parts and labor)

Result: Speedometer function restored, and traction control system operated normally.

Case Study 2: 2018 Chevrolet Malibu U0805 Case Study

Vehicle: 2018 Chevrolet Malibu, 45,000 miles

Problem: Engine performance issues and check engine light illuminated.

Diagnosis: Found U0805 code along with others; further testing indicated a faulty ECM.

Solution: Replaced the ECM and updated software.

Cost: $1,100 (including programming)

Result: Resolved all performance issues, vehicle returned to normal operation.

Diagnose U0805

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: U0805
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes